Well, it's really hard to say exactly what the plot would be with such a strange title. Maybe it could be about Naruto getting into some really wacky adventure where he discovers something odd about himself, like a new power related to that strange phrase. But this is just pure speculation.
The title is so out - there that it's difficult to directly connect to Naruto's character development. But let's assume that the 'pinceof his ass' represents some sort of external force or situation that Naruto has to face. At first, he may be resistant or not know how to handle it. But as the story progresses, he could use his typical Naruto - like determination and positive attitude to overcome it, which would lead to his growth as a character. He could learn valuable lessons about facing the unknown and not being afraid of things that seem strange at first.
It could be a jealous rival from another village. This rival sees Naruto as a threat and decides to play a mean prank on him by giving him a harsh pinch on the ass. This could then lead to a rivalry - based story where Naruto has to prove himself against this rival not just in combat but also in terms of dignity.
No. The official Naruto works are centered around ninja adventures, battles, and the growth of the characters. There's no way something as inappropriate as 'ass drinking' would be part of the official Naruto universe.
It could be Sasuke. Maybe as part of some strange training or prank, Naruto reshapes Sasuke's ass. It would be a really unexpected and funny scenario considering Sasuke's usually serious demeanor.
One possible plot could be that it's a prank gone wrong. Maybe one of his friends, like Kiba, was trying to play a silly joke on Naruto during a training session. Naruto then overreacts and it leads to a comical chase around the training ground as he tries to get revenge.
I'm not entirely sure as this seems like a rather strange and inappropriate topic. Naruto is a popular anime, but such a description goes against the positive nature of the original work. It might be some kind of non - official, inappropriate fan - created work that we should not promote.
No. Firstly, the use of 'big ass' is inappropriate and not in line with the norms of proper fanfic writing. Secondly, while yaoi fanfics about Naruto do exist, ones with such vulgar terms are not likely to gain popularity among the wider Naruto fan community.
Well, from a practical standpoint, comparing the two is like comparing apples and oranges. Their universes have different rules regarding power and physics. In a fanfic, though, the writer can manipulate the story to suit their desired outcome. Maybe Naruto uses his intelligence and strategic thinking along with his chakra powers to defeat Superman. It could be that the fanfic has Superman in a situation where his powers are nullified and Naruto is able to use his ninja skills to gain the upper hand.